The studyCoomarasamy A, Devall AJ, Cheed V, et al. A randomised trial of progesterone in women with bleeding in early pregnancy N Engl J Med 2019;380:1815-24.This project was funded by the NIHR Health Technology Assessment Programme (project number 12/167/26).To read the full NIHR Signal, go to https://discover.dc.nihr.ac.uk/content/signal-000792/miscarriage-not-prevented-by-routine-use-of-progesterone